Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvQuad.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvQuad.java@bd047b71ab37
children 4897a58c8746
rev   line source
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1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class InvQuad
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4 extends Function
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5 {
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6 public static final Derivative DERIVATIVE =
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7 new Derivative("Q'(W) = 1/sqrt(4*n*(W-b)+m^2)") {
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8
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9 @Override
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10 public org.dive4elements.river.artifacts.math.Function
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11 instantiate(double [] parameters)
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12 {
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13 double n = parameters[0];
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14 double m = parameters[1];
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15 final double b = parameters[2];
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16 final double n4 = 4d*n;
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17 final double mm = m*m;
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18
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19 return new org.dive4elements.river.artifacts.math.Function() {
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20 @Override
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21 public double value(double W) {
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22 return 1d/Math.sqrt(n4*(W-b)+mm);
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23 }
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24 };
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25 }
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26 };
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27
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28 public static final Function INSTANCE = new InvQuad();
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29
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30 public InvQuad() {
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31 super(
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32 "inv-quad",
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33 "(sqrt(4*n*W-4*b*n+m^2)-m)/(2*n)",
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34 new String [] { "n", "m", "b" });
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35 }
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36
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37 @Override
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38 public double value(double W, double [] parameters) {
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39 double n = parameters[0];
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40 double m = parameters[1];
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41 double b = parameters[2];
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42 return (Math.sqrt(4d*n*(W - b) + m*m)-m)/(2d*n);
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43 }
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44
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45 @Override
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46 public double [] gradient(double W, double [] parameters) {
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47 double n = parameters[0];
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48 double m = parameters[1];
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49 double b = parameters[2];
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50 double Wb = W-b;
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51 double sn4Wb = Math.sqrt(4d*n*Wb + m*m);
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52 return new double [] {
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53 Wb/(n*sn4Wb)-(sn4Wb-m)/(2d*n*n),
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54 (m/sn4Wb-1d)/(2d*n),
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55 -1d/sn4Wb
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56 };
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57 }
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58
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59 @Override
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60 public Derivative getDerivative() {
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61 return DERIVATIVE;
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62 }
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63
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64 @Override
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65 public Function getInverse() {
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66 return Quad.INSTANCE;
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67 }
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68 }
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69 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org